Question

Tolong dijawab dengan cara

Answer 1

Pembahasan:

Misalkan n = cos(20°)cos(40°)cos(80°)
maka
n sin(20°) =sin(20°)cos(20°)cos(40°)cos(80°)
= 1/2 sin(40°)cos(40°)cos(80°)
= 1/4 sin(80°)cos(80°)
= 1/8 sin(160°)
= 1/8 sin(20°)
atau n = 1/8
sehingga
10cos(20°)cos(40°)cos(80°)
= 10 × n
= 10×(1/8)
= 10/8
= 5/4

Jawab
10cos(20°)cos(40°)cos(80°) = 5/4






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